Find all 40 Spritelings before beating the final boss to get the best castle (and best ending).
Look for a chance to get onto her tail. When she brings up her tail to look around, jump off and Ground Pound her head. Then, pick her up and Piledrive her. Be careful, as she does her Earthquake Rings when she is up again. Repeat this five times. Note: When her Skulls hit three and under, she will do three Earthquake Rings instead of one.
angus lehto.
Rescue the following amount of Spritelings to get different castles in the ending: